Improvement in sewing-machines



PATENT OFFICE.

CARLOS STEBBINS, OF PIKE, NEW YORK.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 118,067, dated August 15, 1871.

To all whom t may concern:

Be it known that I, CARLOS STEBBINS, of Pike, in the county of Vyoming and State ofNew York, have invented a new and useful Improvement in Sewing-Machines, and I do hereby declare that the following' is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification.

This invention relates to improvements in sewin g-machines; and it consists: First, in an arrangement with the cam-plate for working the thread take-np of a device for automatically varyin g the width of theslot, as the cam-plate which is attached to the presser-bar varies by the varying thickness of the cloth, for regulating the action of the take-up more effectually to meet the requirements of cloth of varying thickness than can be done by the present arrangement. Second, in the novel arrangement of the point of the vibrating arm for preserving oil and lessening friction.

Figure l is a side elevation of my improved machine. Fig. 2 is a plan view, and Fig. 3 is a longitudinal elevation ofthe needle-arm joint.

Si milar letters of reference indicate correspon ding parts.

The thread take-up A is pivoted to the vibrating arm B in the usual way, and the short arm is enga-ged by a pin, O, with the slot D of plate E rigidly attached to the presser-bar F. As the 4end of the take-up through which the thread passes falls too low while the pin O passes along' the inclined part of the slot, when the presser rises by increased thickness of the goods, I make this part of said slot wider than the pin C, and introduce the bar b for preventing the pin from rising to the upper wall of said slot, which is accomplished by the said bar being pivoted at the upper end e to the plate, to rise and fall with it, while the lower end is controlled by a pin, j', or other iixed guide on the permanent arm G of the machine in a way to be held against rising, but so as to slide on said pin as much as required to allow the ripper end to move with the plate E. The arrangenient of the said bar relatively to the slot is such that when the plate E rises above a certain point the upper wall of the part a of slot I) will rise above the lower edge of said bar, leaving it in contact with the pin O, which projects far enough beyond the plate E for the purpose. This regulates the falling of the take-up so as to hold the thread more exactly as required when the presser rises, in consequence of the goods beingthicker, and also when it falls as the thinner parts pass under it. The bar b may be connected to the plate E by an adjustable pivot, and the pin j" may also be made adjustable to vary the action of the bar b on the take-up, if preferred. The vibratin g needle-arm joint consists of the round-headed bolts g, support h therefor, and the inverted concave arm i on the end ofthe needle-arm, the said bolts being fitted in sockets adapted for them in the bottom of oilcavities 7c in support h, out of which they rise to be connected to the cap fi, as shown, being inclined either toward each other, as here shown, or in the opposite direction, so that they cannot draw out of the sockets, which are designed to be under-cut so as only to admit the heads or allow them to be taken out by movements in the direction in which they are inclined. The cap i is to be supported slightly above the top of support h, but not so as to create friction, being held by the bolts screwing through it and the jamnuts j. screwed down on it, and serves as a cover for the oil-cups for keeping out the dust and preserving the oil. The capi is so supported by the bolts that all the friction is borne by them in such manner as to reduce it to the minimiun amount due to the wei ght"of the arm. This kind of oscillating joint is applicable to other machinery as well as to sewing-machines. The bearings for the needle-post consist of the tapered, hollow, split-grooved, and screw-threaded boxes K, which, having the post slipped through them and being screwed into screw-threaded holes in the arms L, may be screwed up from time to time as any looseness' by wear is discovered, and will spring up against the post so as to confine it tightly or take up the looseness, and at the same time maintain it in its true central position. This device is also applicable to other reciprocating or revolving rods as Well as to the needle-posts of 2. The improved oscillating joint, consisting sewing-machines, and I propose to make use of of the socketed support h, bolts g, cap i, and it in any case where it is applicable. jam-nuts j, all combined and arranged substan- Having thus described my invention, I claiin tially as speciiied. as new and desire to secure by Letters Patent- CARLOS STEBBINS.

l. The combination,witl1 the slotted cam-plate E and the thread take-up A, of the bar b, all Witnesses: being arranged substantially in the nianner de- G. W. HILLMAN, scribed. F. l). CHANDLER. 

